It is not unusual to have some silvering of the decals of these machines. Most do have some issues with the decals. They sew very well and are usually very dependable. You will be able to find bobbins on Ebay, usually. They are larger in diameter and solid sided. I learned to sew on a machine just like this, only treadle. Remember to turn the hand wheel away, not toward you. That is the main difference with these machines. Good luck in the rehab process. You will succeed.
Donna